Ventilation: Approved Document F, Volume 2 — Buildings other than dwellings

O N L I N E V E R S I O N F1(1) 1.22 The guidance in paragraph 1.21 does not apply to the following sizes of room. a. Small spaces up to 125m3 volume, or 50m2 floor area. b. Large spaces over 800m3 in volume, or 320m2 floor area. 1.23 Where CO monitors are used, they should meet all of the following. 2 a. Be non-dispersive infrared (NDIR) type CO monitors. 2 b. Be mains powered. c. Be placed at breathing height and away from windows, doors or ventilation openings where practicable. d. Be placed at least 500mm from people where practicable. NOTE: Additional details on CO monitoring for indoor air quality can be found in Appendix C. 2 Ventilation for offices Extract ventilation for offices 1.24 Extract ventilation should be provided in offices in all the following areas. a. Sanitary accommodation. b. Bathrooms. c. Washrooms. d. Food and beverage preparation areas. e. Rooms that are designed to contain printers and photocopiers in substantial use (more than 30 minutes per hour). NOTE: Rooms that are designed to contain printers and photocopiers in substantial use (more than 30 minutes per hour) should not be designed to be occupied. 1.25 For rooms designed to contain printers and photocopiers in substantial use (more than 30 minutes per hour), both of the following should apply. a. The air extract rate should be 20 litres per second per machine during use. b. The whole building ventilation rate should be met. 1.26 Sanitary accommodation and bathrooms should have an intermittent air extract rate of both of the following. a. 15 litres per second per shower or bath. b. 6 litres per second per WC pan or urinal. 1.27 Extract ventilators in sanitary accommodation should be capable of continuous operation if required. 9 Building Regulations 2010 Approved Document F Volume 2, 2021 edition O N L I N E V E R S I O N